scholarly journals Modernization of the Belgrade meridian circle

1998 ◽  
pp. 127-129
Author(s):  
G. Pinigin ◽  
I. Pakvor ◽  
A. Shulga
Keyword(s):  
Meridian Circle ◽  
Reading System

The purpose of the modernization of the Belgrade Meridian Circle is laid out. The description of the technical elements of the planned undertaking is also presented. The modernization includes the CCD micrometer, automatic circle reading system (CRS) and the telescope setting system (TSS).

scholarly journals Determination of the Division Corrections of the Bordeaux Declination Circle by the Benevides-Boczko Method

1986 ◽  
Vol 109 ◽  
pp. 543-550
Author(s):  
Y. Requième ◽  
M. Rapaport
Keyword(s):  
Standard Deviation ◽  
Meridian Circle ◽  
Reading System

The automatic declination reading system implemented on the Bordeaux meridian circle with a new divided circle is shortly presented. The determination of the division errors by the Benevides-Boczko method was carried out in December 1982 and in March 1983: the standard deviation between the two sets of corrections is about 0.015″.

scholarly journals The Photoelectric Meridian Circle of the Pulkovo

1986 ◽  
Vol 109 ◽  
pp. 407-411
Author(s):  
V.N. Ershov ◽  
V.E. Pliss ◽  
Yu. S. Streletsky
Keyword(s):  
Standard Errors ◽  
Meridian Circle ◽  
Pulkovo Observatory ◽  
Reading System

The paper reports on the new semiautomatical meridian circle of the Pulkovo observatory. It is equipped with a scanning photoelectric micrometer and a photoelectric circle reading system. The standard errors of a single registration of a star are 0s.016 and 0″.35 in RA and declination, respectively. The limiting magnitude is 10.5m. The instrument can be used for IRS differential observations.

The Carlsberg Automatic Meridian Circle and the plans for Anglo-Danish collaboration

1978 ◽  
Vol 48 ◽  
pp. 219-225 ◽  
Author(s):  
H. J. Fogh Olsen ◽  
L. Helmer
Keyword(s):  
Original System ◽  
Meridian Circle ◽  
Proper Motions ◽  
La Palma ◽  
System A ◽  
Solar System Objects ◽  
New Type ◽  
Reading System ◽  
Data Reading

AbstractThe Brorfelde meridian circle has been automated. This incorporates a telescope setting system, a new type of photoelectric slit micrometer, improved photoelectric circle reading system, met. data reading system with rain detector and photoelectric collimation micrometer all controlled by an HP 2100 minicomputer. The setting system can do the setting within 10 sees to an accuracy of ±2.”. The circle reading system with an accuracy of ±.”04 is more reliable than the original system. These systems have been tested and used for data collection for determination of diam. cor. This includes 1080 readings which are performed automatically in about 9 hours. The remaining equipment has been built and is being tested during the year 1978. After final tests it is planned to move the telescope to La Palma in collaboration with RGO and IAC. It is hoped to erect the instrument at La Palma at the end of 1980. At least 100 000 o bs. per year with an m. s.e. of.”20 are expected. In ten years time proper motions for at least 200 000 stars with an accuracy of .”014 will be available besides the fundamental work which will include observations of all traditional solar system objects and also day time observations.

scholarly journals An Autocollimation Circle Reading System for the Infrared Meridian Instrument

1995 ◽  
Vol 166 ◽  
pp. 361-361
Author(s):  
V.N. Yershov ◽  
A.A. Nemiro
Keyword(s):  
Optical Axis ◽  
Angular Position ◽  
Optical Center ◽  
Meridian Circle ◽  
Primary Mirror ◽  
Axis Position ◽  
Spherical Mirrors ◽  
Reading System ◽  
Zero Points ◽  
New System

A new autocollimation circle reading system is proposed for the reflector meridian circle (Nemiro and Streletsky, 1988). The instrument will be used for observations in the K-infrared waveband. Instead of the divided circle fixed to the instrument tube the new system has small spherical mirrors polished at the lateral surfaces of the primary mirror. The primary mirror is made from sitall and has an autocollimation system aimed at monitoring its optical axis position. The small spherical mirrors of the circle reading system link the circle readings with the primary's optical axis. The divided circles are fixed unmovable opposite to both lateral surfaces of the primary's optical block. Both surfaces have four spherical mirrors. The distance between the divided circles and the mirrors is equal to the mirrors' radii of curvature. The scales of each circle are illuminated from outside (where the measuring microscopes are placed). The mirrors form autocollimated images of the divisions at the plane of the divisions itself. Averaged coordinates of a division and its autocollimated image give the position of the mirror's optical center, and the semi-difference of the coordinates gives the angular position of the telescope. So, the measurements of the circle positions are differential ones, and any displacements of the microscope zero-points are not critical. The precision of measurements is estimated to be better then 0.05″ (random) and 0.005″ (systematical). The work was supported by the Russian Foundation of Fundamental Investigations (the project's code is 93-02-17095).

scholarly journals Automatic Horizontal Meridian Circle at Pulkovo

1986 ◽  
Vol 109 ◽  
pp. 459-462
Author(s):  
R.I. Gumerov ◽  
V.B. Kapkov ◽  
G.I. Pinigin
Keyword(s):  
Meteorological Data ◽  
Computer Control ◽  
Meridian Circle ◽  
Horizontal Meridian ◽  
Complete Automation ◽  
Reading System

The goal of the new design and modernization of transit circles is complete automation (Pinigin and Shornikov, 1983; Hughes,1982; Requieme and Mazurier,1982). For example, all the essential steps of star observations and the determination of the instrument parameters have been automatized at the Tokyo and Brorfelde Observatories (Yoshizawa and Yasuda, 1982; Fogh Olsen and Helmer, 1978). Computer control was introduced for the automation of all the major operations of the Pulkovo horizontal meridian circle (HMC). This involves an automatic setting system (mirror setting), a circle reading system, two photoelectric eyepiece micrometers, meteorological data sensors and a rotating drive of the pendulum horizon (Figure 1). All these are controlled by a microcomputer of the “Electronica C5-12” type.

scholarly journals Researches on the Accuracy of the DCMT Circle Reading System

1993 ◽  
Vol 156 ◽  
pp. 130-130
Author(s):  
Zhu Zi
Keyword(s):  
Systematic Errors ◽  
Meridian Circle ◽  
Reading System

The declinations of stars are determined by the circle micrometers on the meridian circle. The determined accuracy of declinations depends on the systematic accuracy of the micrometers. The DCMT (Danish Chinese Meridian Telescope) adopts photoelectric scanning micrometers as the circle reading system. It contains 6 micrometers forming 3 pairs to measure the circle posistion simultaneously. The repeatability of the circle reading and systematic errors of micrometers are discussed in this paper.

The Bordeaux Automatic Meridian Circle

1978 ◽  
Vol 48 ◽  
pp. 227-228
Author(s):  
Y. Requième
Keyword(s):  
Mean Square Error ◽  
Mean Square ◽  
Meridian Circle ◽  
The Mean ◽  
Full Automation

In spite of important delays in the initial planning, the full automation of the Bordeaux meridian circle is progressing well and will be ready for regular observations by the middle of the next year. It is expected that the mean square error for one observation will be about ±0.”10 in the two coordinates for declinations up to 87°.

Development of imaging plate for a TEM and its characteristics

1989 ◽  
Vol 47 ◽  
pp. 100-101
Author(s):  
N. Mori ◽  
T. Oikawa ◽  
Y. Harada ◽  
J. Miyahara ◽  
T. Matsuo
Keyword(s):  
Dynamic Range ◽  
Protective Layer ◽  
High Sensitivity ◽  
Imaging Plate ◽  
Phosphor Layer ◽  
Imaging Device ◽  
X Ray Imaging ◽  
New Type ◽  
Basic Characteristics ◽  
Reading System

The Imaging Plate (IP) is a new type imaging device, which was developed for diagnostic x ray imaging. We have reported that usage of the IP for a TEM has many merits; those are high sensitivity, wide dynamic range, and good linearity. However in the previous report the reading system was prototype drum-type-scanner, and IP was also experimentally made, which phosphor layer was 50μm thick with no protective layer. So special care was needed to handle them, and they were used only to make sure the basic characteristics. In this article we report the result of newly developed reading, printing system and high resolution IP for practical use. We mainly discuss the characteristics of the IP here. (Precise performance concerned with the reader and other system are reported in the other article.)Fig.1 shows the schematic cross section of the IP. The IP consists of three parts; protective layer, phosphor layer and support.

The Neurobiology of Reading Differs for Deaf and Hearing Adults

2020 ◽  
pp. 346-359
Author(s):  
Karen Emmorey
Keyword(s):  
Semantic Processing ◽  
Event Related Potentials ◽  
Coarse Grained ◽  
Reading Success ◽  
Deaf Readers ◽  
Electrophysiological Studies ◽  
Deaf Adults ◽  
Related Potentials ◽  
Reading System ◽  
New Evidence

Recent neuroimaging and electrophysiological studies reveal how the reading system successfully adapts when phonological codes are relatively coarse-grained due to reduced auditory input during development. New evidence suggests that the optimal end-state for the reading system may differ for deaf versus hearing adults and indicates that certain neural patterns that are maladaptive for hearing readers may be beneficial for deaf readers. This chapter focuses on deaf adults who are signers and have achieved reading success. Although the left-hemisphere-dominant reading circuit is largely similar in both deaf and hearing individuals, skilled deaf readers exhibit a more bilateral neural response to written words and sentences than their hearing peers, as measured by event-related potentials and functional magnetic resonance imaging. Skilled deaf readers may also rely more on neural regions involved in semantic processing than hearing readers do. Overall, emerging evidence indicates that the neural markers for reading skill may differ for deaf and hearing adults.

CCD micrometer of the Mykolayiv Axial Meridian Circle

1997 ◽  
Vol 13 (1) ◽  
pp. 23-28
Author(s):  
A. N. Kovalchuk ◽  
Yu. I. Protsyuk ◽  
A. V. Shulga
Keyword(s):  
Meridian Circle
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